The Dublin Guitar Quartet goes electric for the third installment of Bang on a Can founding composer Michael Gordon’s series exploring the untapped possibilities of select instruments. In Timber (2012 Next Wave), layered polyrhythms rippled from amplified two-by-fours situated in the round. In 2012’s Rushes, seven bassoonists used circular breathing to sustain clouds of mercurial sound. For Amplified, Gordon’s experiment takes a six-stringed turn. With the audience seated on four sides, the musicians send reverb-saturated pulsations across the aural field while redefining what the guitar as an ensemble instrument can be.